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REVENUE (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning of Period | $ 3,013 | $ 3,800 | $ 3,900
Accruals | 19,321 | 15,581 | 12,871
Payments (Credits) | (19,034) | (16,368) | (12,971)
End of Period | $ 3,300 | 3,013 | 3,800
Minimum |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Accounts Receivable, Additional Narrative Disclosure | 0 |  |
Maximum |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Accounts Receivable, Additional Narrative Disclosure | 37 |  |
Accrued returns |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning of Period | $ 821 | 1,346 | 1,733
Accruals | 680 | 716 | 694
Payments (Credits) | (1,157) | (1,241) | (1,081)
End of Period | 344 | 821 | 1,346
Reserves for prompt pay discounts |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning of Period | 657 | 595 | 625
Accruals | 6,802 | 5,806 | 5,448
Payments (Credits) | (6,680) | (5,744) | (5,478)
End of Period | 779 | 657 | 595
Accrued wholesaler service fees |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning of Period | 839 | 735 | 745
Accruals | 5,194 | 4,403 | 4,118
Payments (Credits) | (4,866) | (4,299) | (4,128)
End of Period | 1,167 | 839 | 735
Accrued rebates and chargebacks |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning of Period | 696 | 1,124 | 797
Accruals | 6,645 | 4,656 | 2,611
Payments (Credits) | (6,331) | (5,084) | (2,284)
End of Period | $ 1,010 | $ 696 | $ 1,124

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